Software Radio: An Enabling Technology for Mobile Communications
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1 Software Radio: An Enabling Technology for Mobile Communications Carles Vilella, Joan L. Pijoan Dep. Communications and Signal Theory La Salle Engineering and Architecture Ramon Llull University Barcelona, Spain
2 Agenda What is software radio? The hardware point of view The software point of view Some relevant experiences
3 Some definitions Software radio A class of reprogrammable or reconfigurable radios the same piece of hardware can perform different functions at different times A radio that is substantially defined in software and whose physical layer behaviour can be significantly altered through changes to its software A radio that accepts fully programmable traffic and control information and supports a broad range of frequencies, air-interfaces and applications software Flexible and all-purpose radios that can implement new and different standards or protocols through reprogramming
4 Some definitions Software radio Emerging and evolving technology enabling flexible radio systems, providing multiple services, multiple band operations, reconfigurability and reprogrammability using software. Analog A / D / A Digital
5 Introduction Hardware radio Software controlled radio Software defined radio Ideal software radio Ultimate sofware radio Low flexibility and capability High flexibility and capability
6 Introduction Hardware radio Software controlled radio Software defined radio Ideal software radio Ultimate sofware radio Hardware radio (HR): the radio is implemented using hardware components only and cannot be modified except through physical intervention * Difficult to upgrade, design and manufacture *
7 Introduction Hardware radio Software controlled radio Software defined radio Ideal software radio Ultimate sofware radio Software controlled radio (SCR). Only the control functions of an SCR are implemented in software. Thus only limited functions are changeable using software. Typically this extends to inter-connects, power levels etc. but not to frequency bands and/or modulation types etc. * HR uc user interface *
8 Introduction Hardware radio Software controlled radio Software defined radio Ideal software radio Ultimate sofware radio Software defined radio (SDR) provide software control of a variety of modulation techniques, wide-band or narrow-band operation, communications security functions (such as hopping), and waveform requirements of current and evolving standards over a broad frequency range. The frequency bands covered may still be constrained at the front-end requiring a switch in the antenna system. * *
9 Introduction Hardware radio Software controlled radio Software defined radio Ideal software radio Ultimate sofware radio Ideal software radio (ISR) provide dramatic improvement over an SDR by eliminating the analog amplification or heterodyne mixing prior to digitalanalog conversion. Programmability extends to the entire system with analog conversion only at the antenna, speaker and microphones. * Ultimate software radio (USR). It accepts fully programmable traffic and control information and supports a broad range of frequencies, air-interfaces & applications software. It can switch from one air interface format to another in milliseconds, use GPS to track the users location, store money using smartcard technology, or provide video so that the user can watch a local broadcast station or receive a satellite transmission. * *
10 Introduction Benefits from software radio Multi-functionality Global mobility Compactness and power efficiency Ease of manufacture Ease of upgrades, runtime reconfiguration and over-the-air updates.
11 Introduction Typical block diagram of a software radio * RF conversion A/D/A IF Baseband Bitstream Criterions: Cohesion among functions within a segment Changes in bandwidth and sampling rate Mapping to hardware * suggested by Joe Mitola
12 Introduction Typical block diagram of a software radio RF conversion A/D/A IF Baseband Bitstream Antenna Trade-off Directional selectivity Wideband, low loss Cost
13 Introduction Typical block diagram of a software radio RF conversion A/D/A IF Baseband Bitstream RF conversion Amplification (LNA and power) and some filtering Conversion from / to RF to / from standard IF In most bands, it must be implemented with analog components
14 Introduction Typical block diagram of a software radio RF conversion A/D/A IF Baseband Bitstream Wideband A/D/A A/D conversion is the major bottleneck Aperture uncertainly, linearity and noise limits performance Dynamic range Sampling frequency = ctant.
15 Introduction Typical block diagram of a software radio RF conversion A/D/A IF Baseband Bitstream IF Conversion from / to IF to / from modulated baseband Complexity depends on IF and IF bandwidth Normally implemented with ASIC (DDC i DUC)
16 Introduction Typical block diagram of a software radio RF conversion A/D/A IF Baseband Bitstream Baseband Modulation, equalization, timing recovery, synchronization,... soft decision Complexity depends on baseband bandwidth and oversampling factor
17 Introduction Typical block diagram of a software radio RF conversion A/D/A IF Baseband Bitstream Bitstream Multiplexing, interleaving, error correction, encryption, signalling, Typically demands an order of magnitude less computational cost than baseband
18 Digital hardware devices to build a reconfigurable platform A/D/A Digital Hardware ASIC Flexibility Efficiency PLD DSP
19 A/D/A A/D/A SDR Sampling Dynamic rate range (db) Music Khz HF RF 75 Mhz 130 VHF RF 650 Mhz 96 UHF RF GHz * Related topics SNR, SFDR, NPR, linearity, DNL, INL, aperture uncertainly, Bandpass sampling, oversampling, quadrature sampling, dithering, * R.H. Walden, A/D converter survey and analysis + J. Mitola III, Software radios. Survey, critical
20 A/D/A Oversampling N bits Quantization Noise Signal bandwidth Low pass filter N + log2( OSF )bits Decimation OSF: oversampling factor
21 A/D/A Bandpass sampling f ' m n f 2 B ' m n n n f + m + f 4 ' m f 4 m = IF n = IF f m High filter requirements Low dynamic range
22 ASIC / DSP / PLD ASIC (Application Specific Integrated Circuit) High speed, low power consumption Low flexibility IF DDC, RSP DUC, TSP DSP (Digital Signal Processor) High flexibility, low cost / MIP, fast time-to-market Low bandwith, high power consumption PLD (Programmable Logic Device) High flexibility and speed, moderate power consumption Difficult to develop applications with Baseband IF, baseband, FPGA, CPLD
23 PLD vs DSP DSP is better when the algorithm exhibits a complicated sequential structure the algorithm needs floating point arithmetic very fast time-to-market is required power consumption is not a big problem PLD is better when the algorithm is deeply pipelined highly parallel integer arithmetic
24 HW strategies Hardware strategies to implement a software radio * 1. DSP based A / D / A DSP * Mark Cummings et al, FPGA in the Soft. Radio
25 Hardware strategies to implement a software radio 1. DSP based 2. DSP + multiple ASIC A / D / A ASIC 1 ASIC 2 ASIC 3 DSP
26 Hardware strategies to implement a software radio 1. DSP based 2. DSP + multiple ASIC 3. Parameterized hardware A / D / A ASIC 1 ASIC 2 ASIC 3 DSP
27 Hardware strategies to implement a software radio 1. DSP based 2. DSP + multiple ASIC 3. Parameterized hardware 4. Dynamically reconfigurable FPGA A / D / A Mem. FPGA
28 Hardware strategies to implement a software radio * 1. DSP based 2. DSP + multiple ASIC 3. Parameterized hardware 4. Dynamically reconfigurable FPGA 5. Vanu concept GPP *
29 Introduction Formal design methodologies that can be used to design and implement software radios in a reconfigurable platform
30 Introduction SCA (software communication architecture) Defines the operating environment for the radio system, including systems and interfaces RF hardware Modem Network Security Host CF CORBA Baseband secure hardware Baseband non-secure hardware
31 The layered radio architecture* Layered architecture From A/D Control info Application layer Soft radio interface layer Configuration layer Processing layer * Srikathyayani Srikanteswara et al, A Soft Radio Architecture for Reconfigurable Platforms
32 The layered radio architecture SRI layer: Coordinates, prioritizes, packetizes the various sources of information Configures the layer SRI layer Memory Programming packets Data packets Data packets Contains the system level description
33 Configuration layer: The layered radio architecture Programs the layer Programming packets Configuration layer Memory Algorithm bits Contains the algorithm hardware description
34 Processing layer: The layered radio architecture Implements radio functionality Static hardware Data from configuration layer Data to configuration layer Processing module reconfigurable hardware
35 Software radio projects SPEAKeasy (US Military, Motorola) JTRS (US Military) Wireless Information Transfer System (Motorola) SDR-3000 (Spectrum Signal Processing) SpectrumWare (MIT) Chariot (Virginia Tech)
36 Some important papers J. Mitola, Software Radios: Survey, Critical Evaluation and Future Directions, IEEE National Telesystems Conference, pp , 1992 J. Mitola, The software radio architecture, IEEE Communications Magazine, Vol. 33, pp , May 1995 Joseph Mitola III, Technical Challenges in the Globalization of Software Radio, IEEE Communications Magazine, Vol. 37, No. 2, pp , Feb Walter H. W. Tuttlebee et al. Software Defined Radio: Facets of a Developing Technology, IEEE Personal Communications Magazine, Vol. 6, No. 2, pp , April 1999 Joseph Mitola III, Software Radio Architecture: A Mathematical Perspective, IEEE Journal on Selected Areas of Communications, Vol 17, No. 4, pp , April 1999 Software Radio Technologies Selected Readings, Edited by Joseph Mitola III and Zoran Zvonar
37 Some interesting papers Anne Wiesler, Friedrich K. Jondral, A Software Radio for Second- and Third-Generation Mobile Systems, IEEE Trans. on Vehicular Technology, Vol. 51, No. 4, pp , July 2002 Jay R. Moorman, Implementation of a 3G W-CDMA Software Radio, ICC 2003, Vol. 4, pp , May 2003 Glossner J. et al, A software-defined communications baseband design, IEEE Communications Magazine, Vol. 41, Issue 1, pp , Jan Kontouris A.A. et al. A software radio approach for the transceiver transition from 2G to 2.5G to 3G, Sixth International Symposium on Signal Processing and its applications, Vol. 2, pp , Aug Kontouris A.A. et al. A reconfigurable radio case study: a software based multi-standard transceiver for UMTS, GSM, EDGE and Bluetooth, Conference on Vehicular Technology, Vol. 2, pp , Oct Bucci G. et al. Smart Antenna BTS based on software radio technique for GSM/DCS system, Conference on Vehicular Technology, Vol. 2, pp , May 2000.
38 Software Radio: An Enabling Technology for Mobile Communications Carles Vilella, Joan L. Pijoan Dep. Communications and Signal Theory La Salle Engineering and Architecture Ramon Llull University Barcelona
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